Research Paper THEMED ISSUE: CRevolution 2: Origin and Evolution of the Colorado River System II GEOSPHERE Birth and evolution of the Virgin River fluvial system: ~1 km of post–5 Ma uplift of the western Colorado Plateau GEOSPHERE, v. 15, no. 3 Cory J. Walk1, Karl E. Karlstrom1, Ryan S. Crow2, and Matthew T. Heizler3 1Department of Earth and Planetary Sciences, University of New Mexico, MSC03-2040, University of New Mexico, Albuquerque, New Mexico 87131-0001, USA https://doi.org/10.1130/GES02019.1 2U.S. Geological Survey, 2255 N. Gemini Drive, Flagstaff, Arizona 86001, USA 3New Mexico Bureau of Geology & Mineral Resources–New Mexico Institute of Mining & Technology, 801 Leroy Place, Socorro, New Mexico 87801, USA 15 figures; 2 tables; 1 set of supplemental files CORRESPONDENCE:
[email protected] ■ ABSTRACT steepness (ksn) and low underlying mantle velocity, whereas there is a weaker correlation between high k and resistant lithologies. Basaltic volcanism has CITATION: Walk, C.J., Karlstrom, K.E., Crow, R.S., and sn Heiz ler, M.T., 2019, Birth and evolution of the Virgin The uplift history of the Colorado Plateau has been debated for over a migrated northeastward at a rate of ~18 km/Ma parallel to the Virgin River River fluvial system: ~1 km of post–5 Ma uplift of the century with still no unified hypotheses for the cause, timing, and rate of between ca. 13 and 0.5 Ma, also suggesting a mantle-driven mechanism for the western Colorado Plateau: Geosphere, v. 15, no. 3, uplift. 40Ar/39Ar and K/Ar dating of recurrent basaltic volcanism over the past combined epeirogenic uplift of the western Colorado Plateau, recurrent slip on p.